The Hitachi 4661485 Boom Cylinder Seal Kit is a factory-direct OEM replacement hydraulic seal kit manufactured by DJF Seals, a China-based hydraulic seal kit manufacturer and construction machinery parts supplier serving B2B buyers worldwide. This kit is precision-engineered for Hitachi ZX200 and ZX210 series excavators, matching OEM specifications for a 120mm bore and 85mm rod diameter. As a wholesale hydraulic cylinder seal kit, it provides a complete repair solution for boom cylinders used in heavy-duty excavation, demolition, and earthmoving applications.

Technical Specifications

What’s Included

As a professional excavator seal kit factory, DJF includes every seal required for a complete boom cylinder overhaul:

• Rod Seals — Twin polyurethane U-cup configuration on the 85mm rod
• Buffer Seal — Absorbs hydraulic pressure surges during boom lift and lower cycles
• Piston Seals — PTFE composite assembly for bidirectional sealing across the 120mm bore
• Wiper / Dust Seal — Double-lip contaminant exclusion design
• Wear Rings / Guide Rings — PTFE composite bands providing 360-degree piston and rod support
• O-Rings & Backup Rings — Oil-resistant NBR with PTFE anti-extrusion backup

Material Quality

DJF manufactures all hydraulic cylinder seal kits using industrial-grade materials:

• Polyurethane (PU) — High tear-strength for dynamic seals
• PTFE Composite — Glass-fiber reinforced for wear rings and piston surfaces
• NBR 90 Shore — Oil-resistant nitrile for static O-ring positions

Compatible Hitachi Excavator Models

This boom cylinder seal kit is compatible with:

• ZX200 / ZX200LC / ZX200-3 / ZX200-3G
• ZX210 / ZX210LC / ZX210-3 / ZX210K-3G
• ZX225USR / ZX225USRK
• EX200 Series (verify cylinder dimensions before ordering)

As a China hydraulic seal kit factory, DJF supports B2B bulk orders for construction machinery distributors, equipment repair shops, and hydraulic service centers worldwide. For wholesale pricing, please contact our sales team.

FAQ

Q: Does DJF offer wholesale pricing for bulk orders?
A: Yes. As a direct manufacturer and factory supplier, DJF offers competitive wholesale pricing for B2B buyers. MOQ and pricing available upon inquiry.

Q: Can this kit be customized for different seal materials?
A: Yes. DJF provides OEM and custom seal kit manufacturing with options for alternative materials.

Q: Is this kit compatible with older Hitachi EX200 excavators?
A: Yes — the 4661485 kit fits EX200 series machines using 120mm bore and 85mm rod boom cylinders.